Illuminating device.



W. H. SPENCER.

ILLUMINATING DEVICE.

APPLICATION FILED JUNE-14,1911.

Patented July 30,1912.

2 SHBETSSHBET 1.

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12x5 nit-1 W 5.111222 ATTORNEYS W. H. SPENCER.

} ILLUMINATING DEVICE.

APPLIUATION rum) JUNE 14, 1911.

"Patented July 30, 1912.

2 SHEET$SHEET 2.

. mmmm INVENTOR .Sm our, leowoltq, ATTORNEYS fWITNl-ISSESQ Zr/y Ma I n strairns PATENT OFFICE.

WILLIAM H, SPENCER, OF NEW YORK, N. Y., ASSIGNORTO GEORGE FRINK SPENCER,

' OF NEWARK, NEW JERSEY.

ILLUMINATING DEVIGE eann ii.

new and useful Improvements in Illuminat ing Devices; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to characters of reference marked there on, which form a part of this specification.

The present invention has reference, generally, to improvements in illuminating devices; and the invention relates, more particularly, to a novel construction of illuminating device adapted to be used to concentrate a bright light, of a desirable tone or color-value, upon the mirror of a microscope, which reflects said light through, theapertures of the stage of said microscope upon the object to be examined, said object being supported by a slide, or other device upon said stage. I

The present invention therefore has for its principal object to provide a novel and sin'iple' illuminating device for concentrat-.

ing light upon the reflecting mirror of a microscope,'or similar instrument.

A. further object of the ,present invention is to provide a means, in connection with an illuminating device, for selecting and passing to the mirror of-a microscope, or similar instrument, rays of light of a, desired color value; or, in otherWords, to provide a means for selecting and passing certain light rays of the spectrum and eliminating or obstructing the passage of the objectionable or undesirable, ora preponderance of objectionable or undesirable rays of the spectrum. Such a means is of great value in the use of a microscope, when examining germs, bacteria or other indistinct formations. Such germs, bacteria, etc, are usually stained in various ays to preserve the same, and when the same are examined in a. light having a prepomilerance of color rays similar to the color of the stain with "which said germs, etc, are treated, it makes the same ditiicult of examination. For this reason, it is most satisfactory to illuminate the, microscope with as nearly perfect a pure white light as can be obtained, since in such Specification of Letters Patent. Application filed June 14, 1911.

' case, the stained germs,

provides in its light modifyingscreen a de- Patented July 30, 1912. I Serial No. 633,086.

etc, no matter of What color are examined in auni-t'orm light of such a neutral valuethat the same are clearly distinguishable. l v i Therefore among the important purposes of the present invention is that of vprovid-i ing such a pure White light. As Will be .Well understood, most artificial light, no matter how generated, possesses a-preponderance of red and yellow rays, which preponclerance must be corrected'and toned down to proper proportion to the other rays of light making up the spectrum before a pure White light is secured. The present invention vice perfectly adapted to secure such. are

sult. While the example. or illustration above mentioned, points out .one purpose 3 and method of using the present invention, it is not intended to limit the tion thereto, but the invention includes the use of means for. eliminatin Wholly or in part any color ray or; rays 0 the spectrum, whereby an illuminating'light of any color or tone may be obtained for any specialor desirable use, as will be understood from the subsequent description of the construction of the present invention.

With the various objects of thisinvention in view, the said invention consists, primarily, in the novel illuminating device hereinafter set fortl and, furthermore, this invention consists in the novel arrangements and combinations of the various finechaniran and their parts, as Well as in the details of the construction thereof, all of ivhich will he more fully described in the following specification,and then finally enibodicdim the clauses of the claim which are appended I toand which form an essential part of this specification. i 'Thc invention is clearly illustrated in the accompanying drawings, in \\l|l('l')1 Figure 1 is av side elcvatiou o'la novel construction of illuminating device made according to and embodying the'prihciples of the present invention; Fig. 2 is a vertical longitudinal section of the. same; and, Fig. 3 is a detail onIsa-section, taken on line 3--3 in said Fig. 2, looking in the direction of the arrow l ,Similar characters of referenceare' cu1- ployedin all of the hercinabovedescribed views, to indicate correspi-uuling-parts;

, ltcferring now to; the said drawings,r thc said vinven- 75 i justed position by means of a lock-screw 6[ The reference-character 7 indicates the other member of said knuckle-element, the same being pivotally connected with its fellowmember 5 by means of a lock-screw 8, the screw-threaded end of which is received in an interiorly threaded boss 9 formed upon said member 7, thereby'providing means for locking said threaded boss 9' formed upon said member 7, thereby providing means for locking said members 5 and 7 of the knuckleelement and the parts respectively connected therewith, in any desired adjusted relation to each other, said adjustment being a swinging adjustmentin a vertical plane. Secured to and supported by means of said member 7 of the knuckle-element is the lower member 10 of a combined hood and reflectorshell, the same being preferably of a conical shape, and the same being further provided with an annular flange 11. The lower portion. of said member 10 is provided with a reduced body-portion 12 providing a screenreceiving socket 13, said body-portion 1.2 ining further piovided. in its bottom wall with an apertureor light-passage let, which is surrounded by an outwardly projecting marginal flange 15. Secured in suitable locations to the inner surface of the said mcmber 10 are the" respective retainerrings 16 and 16 which are adapted to retain in place upon the inner surface of said member 10 a plurality of rellector niembers 17, which are being preferab y made of silvered glass, or any other suitable reflecting material, The reference-cliaracter 18 indicates the upper member of said combined hood. and reflector shell, the same being preferably of a conical shape, and being also provided with an annular flange 19 which is fitted over and registers with the said annular flange it of the lower-member 10. Lock screws 20 pass through the respective and registering annular flanges 11 and 19 so as to retain together in their assembled relation to each other the respective upper and lower members 18 and 10 of the said combined hood and reflector-shell. The said upper member 18 is provided at its upper end with a concave Wall or closure 2l,and arranged against the inner side of the said con'eave wall or closure is a concave concentrating reflector-member22 which is provided with a screw-threaded shank 23, said shank passing through a perforation in said concave wall or closure, and being adapted to receive a lock-nut 24, by means of which the said concentrating reflector-member 22 is retained in its operative position within said upper member 18. Said concentrating reflectorrnember 22 is'provided with a marginal flange or shoulder, as 25, which serves as retaining means for securing the upper ends of a series of reflector-members 26 which are disposed upon the inner surface of the said upper member 18, the lower end of said reflector-members 26 being retained by a retainer ring 27 which is also secured to said upper member 18. Connected with said upper member 18 of the combined hood and reflector-shell is a dome 28, the same being formed with a plurality of. perforations or openings 29 providing ventilating means adapted to permit the escape of the heated air from within the interior of the coinbined hood and reflector-shell. Said dome 28 is provided with a split neck-piece 30, adapted to receive and retain in position, a lamp-socket 31, said neck-piece 30 being provided with a clamping strap 31% for binding the said neck-piece in its holding relation with said lamp-socket 3t. Arranged within said dome 28 is a shade-flange 33, projecting v upwardly within the said dome and registering'in front of said holes or perforations 29,

providing, however, an air-space 34 between the walls of said dome 2S and said shadeflange 3?. Said shade-flange 33 prevents the passage of light-rays through said openings or perforations 29, while permitting the free circulation otthe air therethrough. Secm'ed to said lanip-sra-ket. 31, so as to be suspended within said combined 'hood and reflector-shell, is a lamp or lighting unit 35, the same being preferably of the electric incandescent type, although it will be understood that any style, type. or kind of illuminating unit may be substituted therefor, without departing from the scope of the present. lll't'OllilOlL- Secured within the said screen-receiving socket 18, tormed in connection with the lower member 10 of said combined hood and reflector-shell, is a screen-supporting frame 36, the same registering with an opening 37 in the wall of said body-portion l2 and through which may be introduced a light-controlling or modifying screen.

The said light-modifying screen may b made in various ways. A plain glass screen of the desired tint may be u'sed,'or a screen made of other materials may be employed which will modify the combinations of the various spectrum-rays which are directed 'thcrethrough. Therefore, I do not wish to limit my invention to the particular form of modifying screen shown inthe drawings, although the same is the preferred style of modifying screen. The said light-modifying screen, as shown in the drawings, comprises a transparent receptacle 38 ofglam, and preferably of a flat elongated shape, the same being provided with the, usual neck 39 in which is secured a suitable stopper or cork 40. When in place within said screen-receiving socket 13 and supported by said supporting frame 36, the body ofthe said re- 'ceptacle 38 registers with the aperture or light-passage 14 in the-bottom wall of said body-portion 12. Said transparent glass receptacle 38 is adapted to be filled with a suitable fluid of a desired color which willact to obstruct the passa e of theundesired rays of the spectrum, w ile permitting the 1,5 passage of the desired rays therethroughh The convenience of using said receptacle and v the fluid contained therein, lies in thefact thata nicer and more accurate gradation of the color-toneof the screen may be secured,

since the coloring matter contained in the fluid may be easily increased or decreased until the desiredcolor-tone is obtained; and,

furthermore, a more uniform'and' even distribution of the colorin mattermay be obtained by the use 0 the fluid-carrying medium. a

It will be clearly understood, that the combined hood and reflector shell is lightproof, and the arrangement of reflector members therein causes a. brilliant light to pass through said modifying-screen and the light aperture or passage 14, andmoncentrates a desired color of light-rays upon the mirror of the microscope whichreflects the same upwardly through the aperture of the microscope-stage and upon the objects to be examined. It will also be apparent from an inspection of the drawings, that the said combined hood and reflector-shell is capable '40 of any desired adjustment, owing to its swiveled and articulated connection with its base, thus rendering it easily and quickly adjustable, so as to cast its light upon the mirror of said microscope.

5 I am aware that changes may be made in the general arrangements and combinations of the various devices and parts, as

well'as the details of the constructionoi i the same, without departing from the scope;

of the present invention, as 'set forth in the foregoing specification, and, as defined in the claims which are appended thereto.-

Hence, I do not limit my invention to the exact arrangement and-combinations of the said devices and plarts 'asdescribed in said per portion of said combine hood and reector-shell, redirecting and I intensifying reflector-members s'u'pportedupon the inner sides of said combined hood and reflectorshell, an illuminating unit supported within said combined hood and reflector-shell, and a light-modifying screen supported in regis-v tration with said light outlet.

2. An illuminating device comprisingl a combined hood'and reflectorshell provi ed in its lower-portion with a li ht outlet, a

concentrating reflectorarran e in the upper portion of said combine hood and reflector-shell, redirecting and intensifying reflector-members supported upon the inner sides of said combined hood and'reflector shell, an illuminating unit supportedwithm said combined hood and 'refiector'-shell,--and a light-modifying screen supported in registration with sand light outlet, comprisin a transparent receptacle containing'a flui treated with-coloring matter. v I In testimony that I claim the invention set forth above I have hereunto-set my hand this seven h day of June, 1911.

v WI LLIAM'H. SPENCE'R. v

Witnesses: v

ALBERT Pro on BENITO, CHAS. K. WYA'rr. 

